Simplified inelastic analysis procedure for 2-1/4 Cr - 1 Mo heat exchangers

Conference · Sat Jan 01 04:00:00 EST 1983 · Am. Soc. Mech. Eng., (Pap.); (United States)

OSTI ID:5611340

Veljovich, W; Minami, Jr, H M

It is generally recognized that contemporary inelastic analysis of elevated temperature equipment designed to Section III of the ASME Code can be extremely complex, time consuming, and expensive. The major obstacle to simplifications of the inelastic analysis is the concern that strain redistribution mechanisms will be missed in the simplifications. However, when it can be shown that these mechanisms are not significant, considerable simplifications of inelastic models can be justified and accomplished. Further simplifications may be justified when the consideration of inelastic behavior is limited to a specific design application, material, and service condition. Alloy 2-1/4 Cr 1 Mo, primarily because of its low creep rupture strength and a relatively high yield stress at temperatures between 800/sup 0/F (427/sup 0/C) and 1000/sup 0/F (538/sup 0/C), is greatly limited in its inelastic response by the Code creep-fatigue allowables. This limitation, although undesirable from the low limit it places on allowable stresses, can be used to advantage in justifying simplifications in inelastic analysis for design evaluation. This paper presents a simplified procedure and justification for its use for creep-fatigue and ratchetting evaluation of 2-1/4 Cr 1- Mo steam generators operating between 800/sup 0/F (427/sup 0/C) and 1000/sup 0/F (538/sup 0/C).

• Research Organization: Rockwell International, Canoga Park, CA
• OSTI ID: 5611340
• Report Number(s): CONF-830607-
• Conference Information: Journal Name: Am. Soc. Mech. Eng., (Pap.); (United States) Journal Volume: 83-NE-15
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
ALLOYS
BOILERS
CHROMIUM ALLOYS
CREEP
ELASTICITY
FATIGUE
HEAT EXCHANGERS
HIGH TEMPERATURE
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
STEAM GENERATORS
STRAINS
STRESS ANALYSIS
TENSILE PROPERTIES
VAPOR GENERATORS
YIELD STRENGTH